Fix undocumented public APIs

Change-Id: Ib1837cf0f648d74f46fa3883ac98a72d7554e339
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventModule.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventModule.java
index 232a1fc..04b4abd 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventModule.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventModule.java
@@ -24,6 +24,7 @@
 
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 
+/** Configures handling for an event queue while providing its pool. */
 public class EventModule extends AbstractModule {
 
   @Override
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventPool.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventPool.java
index 84de1bd..25aeef4 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventPool.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventPool.java
@@ -20,6 +20,9 @@
 
 import java.lang.annotation.Retention;
 
+/**
+ * Annotation applied to a ScheduledThreadPoolExecutor.
+ */
 @Retention(RUNTIME)
 @BindingAnnotation
 public @interface EventPool {
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsLogException.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsLogException.java
index 8aa0a35..8b270bf 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsLogException.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsLogException.java
@@ -14,6 +14,7 @@
 
 package com.ericsson.gerrit.plugins.eventslog;
 
+/** Custom exception for events log. */
 public class EventsLogException extends Exception {
   private static final long serialVersionUID = 1L;
 
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/HttpModule.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/HttpModule.java
index 32aa9ff..9bec33f 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/HttpModule.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/HttpModule.java
@@ -16,7 +16,7 @@
 
 import com.google.gerrit.httpd.plugins.HttpPluginModule;
 
-public class HttpModule extends HttpPluginModule {
+class HttpModule extends HttpPluginModule {
   @Override
   protected void configureServlets() {
     serve("/events/").with(EventsRestApiServlet.class);
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/MalformedQueryException.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/MalformedQueryException.java
index 7b37be7..668fc29 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/MalformedQueryException.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/MalformedQueryException.java
@@ -14,6 +14,7 @@
 
 package com.ericsson.gerrit.plugins.eventslog;
 
+/** Custom exception for malformed queries. */
 public class MalformedQueryException extends EventsLogException {
   private static final long serialVersionUID = 1L;
   private static final String MESSAGE =
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/QueryMaker.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/QueryMaker.java
index 0e0b6c7..8f1360f 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/QueryMaker.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/QueryMaker.java
@@ -16,6 +16,7 @@
 
 import java.util.Map;
 
+/** Helps build well-formed database query strings. */
 public interface QueryMaker {
 
   /**